You confront him by talking about it like adults. However, that won't change the behavior. Its like asking a person that road rages to calm down. If he is going to nerd rage, he will nerd rage. He isn't going to catch himself in the middle of nerd raging. He might grow out of it, but its not going to be any time soon. And he won't grow out of nerd raging because you had a talk.
You're welcome ☺️
You confront him by talking about it like adults. However, that won't change the behavior. Its like asking a person that road rages to calm down. If he is going to nerd rage, he will nerd rage. He isn't going to catch himself in the middle of nerd raging. He might grow out of it, but its not going to be any time soon. And he won't grow out of nerd raging because you had a talk.